PITTSBURG -- Starting Monday night, westbound lanes of Highway 4 through Pittsburg will be closed for several hours on most days so workers can install temporary supports at Loveridge Road for the construction of a new bridge, according to a Caltrans release.

Westbound Highway 4 lanes will be closed 11 p.m. to 3:30 a.m. Sunday through Thursday nights and Saturday morning from midnight to 6 a.m. The project, scheduled to last several weeks, is part of the widening of Highway 4 from four to eight lanes.

Drivers will be detoured off Highway 4 at the Somersville Road/Auto Center Drive exit in Antioch and west on Pittsburg-Antioch Highway to Loveridge.